How does putting the cold and wet napkin on the forehead of a person help him combat fever?

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Solution

Wet clothes on the forehead will help us to feel better when we are affected by fever.
The water on the cloth will undergo the process of evaporation.
The latent heat of vaporization for the process is absorbed from the area of contact.
As a result the temperature of the forehead decreases and gives a soothing effect.

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